Determination of Comparison Period Using First Method if New change validation Attribute Is Not Flagged 
Prerequisites
The Toolbox uses this variant if you
It is assumed that the third-party system has received the data from the retroactive accounting periods as well as from the original periods.
Use
The specification of the precedent for the payroll period in change validation has been converted. For compatibility reasons, SAP supports this variant.
Disadvantages
In retroactive accounting for payroll, the preceding payroll periods are defined using the following rules:
Rule 1
For the first retroactive accounting period in payroll, the preceding period is the most recent payroll period in the
in-period view that matches the current payroll period in the for-period view. If this payroll period does not exist, then the system does not call up a preceding period for the data comparison.Rule 2
For the following retroactive accounting periods and the original period for payroll, the system always uses the preceding retroactive accounting periods.
These rules are described in an example.

The payroll periods listed in the table are applicable for an employee.
Sequential no. |
For-period |
In-period |
Preceding period |
Explanation |
00001 |
01 2000 |
01 2000 |
none |
First export |
00002 |
02 2000 |
02 2000 |
00001 |
|
00003 |
03 2000 |
03 2000 |
00002 |
|
00004 |
04 2000 |
04 2000 |
00003 |
|
00005 |
02 2000 |
05 2000 |
00002 |
Preceding period according to rule 1 |
00006 |
03 2000 |
05 2000 |
00005 |
Preceding period according to rule 2 |
00007 |
04 2000 |
05 2000 |
00006 |
Preceding period according to rule 2 |
00008 |
05 2000 |
05 2000 |
00007 |
Preceding period according to rule 2 |